Bobbin body having rthread end attaching means



June 23, 1964 P. LUBER- 3,138,345

BOBBIN BODY HAVING THREAD END ATTACHING MEANS Filed Sept. 22, 1961 3 Sheets-Sheet l PAUL L UBEE.

June 23, 1964 P. LUBER 3,138,345

BOBBIN BODY HAVING THREAD END ATTACHING MEANS Filed Sept. 22, 1961 3 Sheets-Sheet 2 PA UL L (7352 Jn venfor:

June 23, 1964 P. LUBER 3,133,345

BOBBIN BODY HAVING THREAD END ATTACHING-MEANS Filed Sept. 22, 1961 5 Sheets-Sheet 5 J11 venfa r: P UL Luase United States Patent 3,138,345 BOBBIN BODY HAVING THREAD END ATTACHlNG MEANS Paul Liiher, Winterthur, Switzerland, assignor to Sulzer Freres, S.A., Winterthur, Switzerland, a corporation of Switzerland Filed Sept. 22, 1961, Ser. No. 139,985 Claims priority, application Switzerland Sept. 27, 1960 4 Claims. (Cl. 242-1251) The invention relates to a bobbin body, more particularly to conical bobbin bodies for yarn. The bobbin body according to the invention is suitable, for example, for supporting the weft thread in looms for weaving of the gripper shuttle type wherein the yarn spools remain outside of the shed and are stationary during Weaving.

The bobbin body according to the invention is conical and has circumferential grooves, each groove having, at the side of the reduced diameter of the body, a wall portion which is substantially normal to the longitudinal axis of the bobbin body, the rest of the wall of the groove being inclined with respect to the longitudinal axis of the bobbin. This particular configuration of the grooves causes the last windings to stay on the bobbin in their original position until they are unwound and not to slip or move axially prior to being unwound. Experience has shown that this is true not only for parallel but also for cross wound bobbins. The last windings of cross wound bobbins are held in place by sagging into the grooves over which the yarn passes at a slant and are held by friction on the edges formed by the intersection of the wall portions which are normal to the axis of the bobbin and the inclined wall portions of the grooves, but are easily unwound. Since the last yarn windings remain in their initial position until they are unwound, formation of loops and twisting is prevented and, if the spools are used on looms, faulty weaving or thread breakages are avoided. Particularly in looms having a plurality of stationary yarn spools outside of the shed, it is important that the first yarn spool is completely unwound without any disturbance when unwinding the last windings so that the next following spool can be started without faults in weaving and showing on the fabric.

In an embodiment of the invention the grooved bobbin is formed by a perforated conical tube permitting passage of fluid for treating the yarn, for example for damping, bleaching or dyeing. The bobbin which has been wound can be treated andthereupon immediately placed on the weaving machine, respooling yarn being unnecessary.

In an embodiment of the invention each circumferential groove on the conical surface of the bobbin has a radial wall portion at the small diameter side of the groove and has a slanted wall portion forming the bottom of the groove, there being an annular spacing portion formed by the conical surface of the bobbin between the grooves. The axial extensions of the slanted portion and of the spacing portion are substantially equal. If holes are provided, these are placed in offset relation on the slanted portions and on the spacing portions. This arrangement facilitates flow of the treating fluid, for example, a dyeing mixture to all parts of the yarn bobbin and homogeneous dyeing of the yarn. There are no perforations at the edge formed by the slanted wall portions and the spacing portions which edge may catch the unwinding yarn.

The bobbin according to the invention is preferably made of a synthetic substance which is heatproof up to at least 212 F., for example, a polyvinyl acetate.

In an embodiment of the invention a slot is provided in the tube forming the bobbin for attaching the thread end. The slot is preferably placed at one end of the tube and on the outside thereof and does not extend to 3,138,345 Patented June 23, 1964 "Ice the inside. This prevents entry of liquid treating agent into the slot as it would be the case if the slot would extend to the inside of the tube. The bobbin according to the invention, although provided with a thread end holding slot, can therefore be used for damping, bleaching and dyeing, and respooling of the yarn after treatment is not required. Since the slot does not penetrate to the inside of the tube, the latter is not weakened as it would be the case if the slot would extend all the way through the tube wall.

The novel features which are considered characteristic of the invention are set forth with particularity in the appended claims. The invention itself, however, and additional objects and advantages thereof will best be understood from the following description of embodiments thereof when read in connection with the accompanying drawing wherein:

FIG. 1 is a side view of a bobbin body according to the invention.

FIG. 2 is an end View of the bobbin body shown in FIG. 1, looking from the left side of FIG. 1.

FIG. 3 is a longitudinal sectional large scale view of a portion of the bobbin body shown in FIG. 1.

FIG. 4 is a longitudinal sectional View of a portion of a modified bobbin body.

FIG. 5 is a side view of a bobbin body having a thread end attaching means according to the invention.

FIG. 6 is an end view of the bobbin body shown in FIG. 5, seen from the left side of FIG. 6.

FIG. 7 is a longitudinal sectional view of a portion of the bobbin body shown in FIG. 5.

FIG. 8 illustrates a modification of the thread end attaching means of the bobbin body shown in FIG. 5.

FIG. 9 is a side view of the left end portion of the bobbin body whose left end is shown in FIG. 8.

Equivalent parts are designated by like numerals in the various figures.

Referring more particularly to the drawing, numeral 1 designates a hollow conical bobbin body having a conicity angle A of 4. The outer surface is provided with a plurality of circumferential grooves 2. Each groove has a wall portion 4 at the small diameter side of the groove, i.e., the side facing the small diameter end 13 of the bobbin body. The wall portions 4 are normal to the longitudinal axis 5 of the bobbin body whereas the rest 6 of the wall of each groove is conical, i.e. at a slant with respect to the longitudinal axis 5, the conicity angle being greater than the angle A. The axial extension of the inclined wall portion 6 of the grooves 2 amounts to about one half of the axial spacing '7 between the wall portions 4 of two adjacent grooves, i.e., to approximately one half of the axial distance between the bottoms 8 of two adjacent grooves. There is a conical surface 9 between the large diameter end of one groove and the wall portion 4 of the adjacent groove; the axial extension of the surface 9 is approximately equal to the axial extension of the slanted wall portion 6 and the angle of conicity of the surface 9 is equal to that of the entire bobbin body, i.e. is about 4 in the illustrated example.

A plurality of radial holes 11 are provided in each of the sections of the bobbin body confined by the surface portions 9, affording passage of treating agents, particularly dyeing liquids. The sections of the bobbin body confined by the wall portions 6 are provided with a number of holes 12 equal to the number of holes in the sections confined by the surfaces 9, the holes of adjacent sections being offset. Only one hole 11 is illustrated. The positions of the other holes 11 and of the holes 12 are indicated by crosses.

An annular groove 13 is provided adjacent to the small diameter end 3 of the bobbin body which groove is free of holes. Two coaxial annular grooves 15, free a of holes, are provided at the left end 14 of the bobbin body. The grooves 13 and 15, which have a radial wall portion at the small diameter side and an inclined wall portion extending from the radial wall portion to the large diameter end of the bobbin body, provide a particularly good hold of the last windings of the yarn wound on the bobbin body. At the large diameter end 14 of the bobbin body a shallow annular groove 18 of rounded configuration is provided which serves for winding a few windings of yarn onto the bobbin body prior to the spooling operation.

The walls 16 of the holes 11 and 12 are preferably conical as seen in FIG. 3.

The bobbin body 1 is made of synthetic material which is heatproof up to at least 212 F. Materials known as polyplast, for example a polyvinyl acetate, are suitable.

In the modification shown in FIG. 4 the wall portion at the small diameter side of an annular groove 2' is at an angle B of preferably not more than 10 with respect to a radial plane 19. If the angle B is greater than 10 the groove cannot have the desired yarn retaining etfect.

The bobbin body illustrated in FIGS. 5 and 6 has three slots 31 at the large diameter end 14 for attaching the end of the yarn. The slots extend from a location 32 of the circumference 33 of the bobbin body to a location 34 of the circumference without extending through the inside surface of the tube forming the bobbin body. As seen in FIG. 6, the innermost portion 35 of the groove 31 is spaced from the interior surface 36 of the conical tube forming the bobbin body. This assures that no treating liquid, for example dyeing liquid, flows from the inside of the bobbin body through the slots and that the liquid flows exclusively in a radial direction through the holes 11 and 12, as is desired. With the arrangement according to the invention of the slots for making fast the yarn ends the dyeing process is not disturbed.

In the modification shown in FIGS. 8 and 9 a slot 31 is provided at the end 14 of the bobbin body 1 which slot is plane, secantlike extending through the end 14 of the bobbin body. This configuration of the slot permits cutting of the slot into the finished bobbin body at any time. The slot leaves a thumblike portion 41 at the outside of the bobbin body whose end does not extend to the end 14 of the bobbin body. This affords placing the thread end first at the outermost portion 42 of the slot plane and subsequent movement of the yarn into the slot 31.

If desired, slots for holding thread ends may also be provided at the small diameter end 3 of the bobbin body. Only one slot may be found sufiicient.

I claim:

1. A hollow conical bobbin body particularly for supporting the weft thread in looms wherein the thread is pulled by gripper shuttles from the bobbins which remain outside of the shed during weaving, comprising:

a conical outside surface,

said outside surface having a portion onto which the thread is wound and from which it is unwound,

axially spaced circumferential grooves in said outside surface and distributed'over the entire axial extension of said portion,

each groove having a substantially radial annular wall portion toward the small diameter end of the bobbin body and extending substantially normal to the longitudinal axis of the bobbin body,

the rest of each groove being a wall portion inclined toward the large diameter end of the bobbin body and relative to said conical outside surface,

a conical annular spacing surface interposed between each two of said grooves,

said spacing surfaces having the same conicity as said outside surface and forming part thereof,

the intersection of said spacing surfaces and of said radial wall portions forming annular edges for preventing slipping of the last unwound layers of thread on said outside surface,

an end surface at the large diameter end of the bobbin body, and

a slot formed by a tongue-like portion of the bobbin body for making fast a thread end on the bobbin body,

said slot extending through said end surface secantlike into the bobbin body between the inside and outside surfaces of the hollow bobbin body and between two circumferentially spaced locations on said outside surface.

2. A conical bobbin body as defined in claim 1, wherein said substantially radial annular wall portion declines toward the small diameter end of the bobbin body and forms an angle of not more than 10 with the normal to the longitudinal axis of the bearing body.

3. A conical bobbin body as defined in claim 1, further provided with circumferentially spaced perforations extending from the inside to the outside of the bobbin body for conducting treating fluid for the thread Wound on the bobbin body.

4. A conical bobbin body as defined in claim 3, wherein said perforations are located in the wall portions of said grooves which are inclined relative to said conical outside surface and in said annular spacing surfaces.

References Cited in the file of this patent UNITED STATES PATENTS 1,924,510 Parks Aug. 29, 1933 1,993,143 Jones Mar. 5, 1935 3,015,945 Jungbecker Jan. 9, 1962 FOREIGN PATENTS 12,391 Great Britain of 1910 332,555 Great Britain July 22, 1930 

1. A HOLLOW CONICAL BOBBIN BODY PARTICULARLY FOR SUPPORTING THE WEFT THREAD IN LOOMS WHEREIN THE THREAD IS PULLED BY GRIPPER SHUTTLES FROM THE BOBBINS WHICH REMAIN OUTSIDE OF THE SHED DURING WEAVING, COMPRISING: A CONICAL OUTSIDE SURFACE, SAID OUTSIDE SURFACE HAVING A PORTION ONTO WHICH THE THREAD IS WOUND AND FROM WHICH IT IS UNWOUND, AXIALLY SPACED CIRCUMFERENTIAL GROOVES IN SAID OUTSIDE SURFACE AND DISTRIBUTED OVER THE ENTIRE AXIAL EXTENSION OF SAID PORTION, EACH GROOVE HAVING A SUBSTANTIALLY RADIAL ANNULAR WALL PORTION TOWARD THE SMALL DIAMETER END OF THE BOBBIN BODY AND EXTENDING SUBSTANTIALLY NORMAL TO THE LONGITUDINAL AXIS OF THE BOBBIN BODY, THE REST OF EACH GROOVE BEING A WALL PORTION INCLINED TOWARD THE LARGE DIAMETER END OF THE BOBBIN BODY AND RELATIVE TO SAID CONICAL OUTSIDE SURFACE, A CONICAL ANNULAR SPACING SURFACE INTERPOSED BETWEEN EACH TWO OF SAID GROOVES, SAID SPACING SURFACES HAVING THE SAME CONICITY AS SAID OUTSIDE SURFACE AND FORMING PART THEREOF, THE INTERSECTION OF SAID SPACING SURFACES AND OF SAID RADIAL WALL PORTIONS FORMING ANNULAR EDGES FOR PREVENTING SLIPPING OF THE LAST UNWOUND LAYERS OF THREAD ON SAID OUTSIDE SURFACE, AN END SURFACE AT THE LARGE DIAMETER END OF THE BOBBIN BODY, AND A SLOT FORMED BY A TONGUE-LIKE PORTION OF THE BOBBIN BODY FOR MAKING FAST A THREAD END ON THE BOBBIN BODY, SAID SLOT EXTENDING THROUGH SAID END SURFACE SECANTLIKE INTO THE BOBBIN BODY BETWEEN THE INSIDE AND OUTSIDE SURFACES OF THE HOLLOW BOBBIN BODY AND BETWEEN TWO CIRCUMFERENTIALLY SPACED LOCATIONS ON SAID OUTSIDE SURFACE. 